When is the president of the senate allowed to vote on legislative matters?

The president of the Senate is allowed to vote on legislative matters in order to break a tie vote on a bill. Explanation; Under Article I, section 3 of the constitution, The vice president of the United states shall be the president of the state, but shall have no vote; unless they be equally divided.

Explanation:

 The correct answer is :  The president of the Senate is allowed to vote on legislative matters only in case of a tie in a bill. He will be in charge of breaking the tie.

Explanation:  The vice president of the United States is appointed as president of the Senate by constitution, but he is given little power.